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(11) | EP 0 932 198 B1 |
| (12) | EUROPEAN PATENT SPECIFICATION |
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| (54) |
PROCESS FOR MANUFACTURING SEMICONDUCTOR PACKAGE AND CIRCUIT BOARD ASSEMBLY HERSTELLUNG VON HALBLEITERGEHÄUSEN UND LEITERPLATTENANORDNUNG PROCÉDÉ DE PRODUCTION D'UN BOÎTIER POUR SEMI-CONDUCTEUR ET SYSTÈME DE CARTE DE CIRCUITS |
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| Note: Within nine months from the publication of the mention of the grant of the European patent, any person may give notice to the European Patent Office of opposition to the European patent granted. Notice of opposition shall be filed in a written reasoned statement. It shall not be deemed to have been filed until the opposition fee has been paid. (Art. 99(1) European Patent Convention). |
Technical Field
[0001] The present invention relates to a manufacturing process for a small-sized and thin type semiconductor package. More particularly, to a manufacturing process for a semiconductor package by which an circuit substrate will not be wasted and which allows a plurality of packages to be taken from the substrate thereby having the highly productivity and to an circuit substrate aggregation used for manufacturing such packages.
Background Technology
[0002] EP 0 689 245 A2 discloses a method of manufacturing electronic devices using molding resin, wherein the electronic element is cut from the resin bloc. US 4,530,152 shows a similar device with resin as encapsulation material with use of a temporary substrate wherein the electronic element is formed.
[0003] As a semiconductor package becomes smaller and more integrated, the flip-chip bonding method has been developed wherein a bare chip is directly mounted on a substrate with its face directed downward. More recently, a variety of portable tools such as a VTR having a camera integrated into and a personal handy telephone is appearing into the market one after another and such a portable tool has a package as small as a bare chip integrated into it, namely a chip size/scale package (CSP). Because of such a situation, CSP's are strongly needed in the market, thereby the development of CSP's recently is accelerating.
[0004] In manufacturing circuit board aggregation 100 at a manufacturer's site, a roll of 1m wide glass filler sheet having a resin impregnated thereinto is guillotined in accordance with a standard size of 1m x 1m or 1m x 1.2m. Then, a copper film is laminated onto the both sides of the standardized sheet, which will be pressed into an original substrate. The original substrate is further cut into substrate materials with a convenient and readily usable size.
[0005] In Fig. 20, a plan view of substrate material 110 is shown. This substrate material is obtained by cutting an original sheet with a standard size into nine pieces. Substrate material 110 measures 330mm wide (W) and 330mm long (L). For example, ten (10) strips of circuit board substrate 100 will be obtained by cutting this substrate material 110. Each circuit board substrate is, for example, 56mm wide (W1) and 115mm long (L1). Each circuit board substrate 100 is, as illustrated in Fig. 20, arranged as two vertical rows X five horizontal columns.
[0006] In Fig. 21, an example of a circuit board substrate 100 is shown. Circuit board substrate has a blank area (margins) for manufacturing packages along the perimeter. In particular, the substrate has a b1 wide (for example 5mm) manufacturing blank area along the vertical perimeter and b2 wide (for example 7mm) manufacturing blank area along the horizontal perimeter.
[0007] In the area surrounded by the manufacturing blank area of the circuit board substrate 100, cut lines 2 are formed in the X and Y directions which are perpendicular to each other so as for a plurality of individual circuit boards 1 to be obtained by cutting it. From circuit board substrate 100 as shown in Fig. 21, fifty-five (= 5 X 11) circuit boards having the size of 9mm X 9mm can be obtained.
[0008] A conventional manufacturing process for CSP type semiconductor packages will now be briefly explained by referring to Figs. 22 and 23. In (A) - (C) of Fig. 22 and (A) - (C) of Fig. 23, respectively, top plan views are shown in the right side of the figures while cross-sectional views obtained by cutting the top plan views along the lines A-A are shown in the left side. In the example of Figs. 22 and 23, four circuit boards are illustrated to be taken.
[0009] A conventional process for manufacturing semiconductor packages includes the steps for forming a circuit board substrate ((A) of Fig. 22), mounting IC chips onto the substrate ((B) of Fig. 22), encapsulating the mounted chips with resin ((C) of Fig. 22), attaching standard member on the encapsulated (sealing) chips ((A) of Fig. 23), dicing the chips ((B) of Fig. 23) and forming electrodes on the chips ((C) of Fig. 23).
[0010] In manufacturing semiconductor packages, through-holes (not shown) are formed on the circuit board substrate 100 both of the surfaces of which are copper laminated in the step of forming the circuit board substrate.
[0011] Then, on the both surfaces of this circuit board substrate 100, a copper-plated layer is formed by means of electroless copper plating and electro copper plating. Further, the copper-plated layer is laminated with etchng resist, which will be sequentially exposed to light and developed to form a pattern mask. Thereafter, the copper-plated is subjected to pattern etching via this pattern mask by using etching solution. Through this pattern etching process, several sets of IC connecting electrodes (bonding pattern) 3 for a plurality of chips are formed on the upper surface of circuit board substrate 100 and external connection electrodes 4, which are pad electrodes arranged in a matrix, are formed on the bottom side, respectively.
[0012] Next, a solder resist processing follows, thereby forming a resist film on the bottom side of circuit board substrate 100. This resist film has openings where external connection electrodes 4, which are the solderable region, are exposed. By forming this resist film in this way, the bottom surface of integrated circuit board surface 100 will be planarized. Thus, circuit board substrate is completed wherein a number of same-shaped platable regions are arranged on the bottom surface in a matrix manner ((A) of Fig. 22).
[0013] In the next step of mounting IC chips on the substrate, solder bumps 5 are formed on the pad electrode of the IC wafer (not shown). The process for forming solder bumps 5 includes the stud bump method, ball bump method and plated bump method. The plated bump method among these is suitable for miniaturizing IC chips because it allows the bumps to be formed in a narrowly spaced arrangement between the pad electrodes.
[0014] Then, the IC wafer on which solder bumps are formed is cut into chips of a predetermined size while being attached on a adhesive tape, thereby IC chips 6. In this cutting process, the full-cut scheme is employed in cutting the wafer in the X and Y directions with an apparatus such as a dicing saw. After the wafer is cut, IC chips 6 on the adhesive tape is separated into a plurality of individual units.
[0015] Next, flux (not shown) is applied onto a predetermined location of either the solder bumps of the divided IC chips or IC connecting electrodes 3 formed on the upper surface of circuit board substrate 100. When this is completed, IC chips 6 are mounted on the main surface of circuit board substrate 100 in such a manner that one chip is mounted on a single circuit board. The surface of IC chip 6 on which solder bumps 5 are formed is opposed against the upper side of circuit board substrate and solder bumps 5 are positioned on IC connecting electrodes 3. Then, IC connecting electrodes 3 are electrically connected to IC chips 6 by means of a solder reflow processing. As described above, IC chips 6 are (flip-chip) mounted onto circuit board substrate 100 ((B) of Fig. 22).
[0016] In the next encapsulation step, more than one IC chip 6 are integrally encapsulated using a thermosetting resin 7 by performing a side-potting across the adjacent IC chips 6. In such a manner, these IC chip 6 are secured on each circuit board 1 of the circuit board substrate 100 with the face down direction as shown in (C) of Fig. 22.
[0017] In the next step of attaching a standard member, the planar bottom surface of circuit substrate aggregation on which IC chips are mounted is attached to standard member 8 by using a adhesive or a PSA (pressure-sensitive adhesive) tape. The adhesion between circuit board substrate 100 and standard member 8 is secure because both of the attached surfaces are planar ((A) of Fig. 23).
[0018] In the next dicing step, as shown in (B) of Fig. 23, circuit substrate aggregation 100 is cut with a cutting device such as a dicing saw along the cut lines formed on circuit board substrate in the X and Y directions and the cut circuit boards 1 are separated into individual circuit boards. 1. Here a dicing machine DFD-640 (product name) equipped with a dicing blade NBC-ZB1090S3 (product name) both manufactured by Disco Corporation is used in this cutting process.
[0019] After the dicing step, circuit boards 1 are detached from standard member 8 by dissolving the adhesive for example with a solution.
[0020] In the next step of forming electrodes, solder balls are attached to the location of external connection electrodes 4 formed on the bottom surface of the individual circuit board. Then, the solder balls are subjected to a reflow process and ball electrodes are formed.
[0021] The above described steps complete the formation of individual flip-chip BGA's (ball grid arrays) 200.
[0022] However, the above described process for manufacturing semiconductor packages suffers from the following problems. In the conventional method, solder ball electrodes are individually formed on a single circuit board already diced from integrated semiconductor circuit board substrates. Thus, in a small package CSP, the distance between the perimeter of a circuit board and the center of the solder ball electrode positioned most adjacent to the perimeter tends to be small, so that it will be difficult to maintain the blank area reserved to secure an apparatus for attaching solder balls in the step of forming solder balls. Further, since solder balls are attached to each of the single circuit boards, the productivity of this method is low, thereby the manufacturing cost increases.
[0023] Also the conventional circuit board substrates have further problems. As small portable devices are required to be miniaturized, the packages have been strongly requested to be miniaturized and made thinner as well, so as to lower the manufacturing cost of the packages as much as possible. Since blank areas are reserved for manufacturing purposes, the number of the circuit boards to be taken therefrom tends to be small. For example, when the blank area b2 along the horizontally oriented F1 is 7mm wide, the total width of the two blank areas for manufacturing purposes along the both sides will be 14mm, which is equal to more than one row of circuit boards 1 which is 9mm X 9mm. If all the blank areas are eliminated from circuit board substrate 100 as shown in Fig. 21, as many as sixty circuit boards, which is 9mm X 9mm, can be taken from the substrate. In reality, however, only 55 circuit boards 1 may be taken because there exist blank areas. Therefore, about 9 % of the circuit board substrate will be wasted.
[0024] Accordingly, it would be appreciated from the above context that an object of the present invention is to provide a circuit board substrate the productivity of which is high and thus which may be preferably used to manufacture semiconductor substrates at a low cost.
Disclosure of the Invention
[0025] The process for manufacturing a semiconductor package with mounted IC chips of the present invention is characterized by the process defined in claim 1. formed on all circuit boards of the circuit board substrate at the same time. This ensures the highly productivity and the reduction of the production costs.
[0026] In addition, since the electrodes having the projection are simultaneously formed on each circuit board of the circuit board substrate, the margin for the fabrication of the circuit board substrate can be used as the margin for a solder ball on anchoring jig in the electrodes having projection forming step for.
[0027] Accordingly, a reliable, highly productive, and inexpensive process for manufacturing the semiconductor packages which is suitable for mounting on small portable equipment can be provided by the present invention.
[0028] In the process for manufacturing the semiconductor packages of the present invention, a spacer is provided on the area from which the circuit board packages are separated such as a margin of fabrication. When the area to be separated is secured to the standard member through this spacer, pieces in the separation area can be prevented from jumping up and down in the dicing machine during the cutting operation. As a result, damage of the dicing blades and IC chips can be prevented.
[0029] Moreover, the circuit board substrate of the present invention is provided with the margins of fabrication only along the peripheries of two opposing sides out of four sides of the quadrilateral surrounding the circuit board aggregation. This enables a greater number of circuit boards to be made from the circuit boards substrate.
[0030] Accordingly, a circuit board substrate which is suitable for the manufacture of semiconductor packages inexpensively and with high productivity can be provided by the present invention.
[0031] Moreover, the manufacturing process can be automated and productivity of the circuit board substrate can be further improved by providing a substrate with a width (W) equivalent to a common length (A) which satisfies the following conditions . Specifically, a length M1 obtained by dividing the original length (L) of one side of a specified size substrate by K1 (M1=L/K1) and a length M2 obtained by dividing the original length (L) by K2 (M2=L/K2) are respectively a product of the common length (A) multiplied by an integer. This substantially reduces the production costs for circuit board substrate of the present invention, which results in a decrease in manufacturing costs of the semiconductor packages.
Brief Description of the Drawings
[0032]
Figs. 1 (A) - (D) relate to the first example, not according to the invention, and show step diagrams to be referred in describing a process for manufacturing semiconductor packages wherein (A) shows a diagram to be referred to in describing the step of forming electrodes, (B) shows a diagram to be referred to in describing the step of affixation, (C) shows a diagram to be referred to in describing the step of dicing and (D) shows a completed semiconductor package. In each of figures (A) through (D), a plan view is shown on the right side while the cross sectional view cut along A-A of the plan view is shown on the left side.
Figs. 2 (A) and (B) relate to the first example and show diagrams which will be referred to in describing the step of planarization wherein (A) shows a cross sectional view used to describe a first exemplary option and (B) shows a cross sectional view used to describe a second exemplary option.
Figs. 3 (A) and (B) relate to the first example and show diagrams which will be referred to in describing the step of forming planar surfaces wherein (A) shows a cross sectional view to be referred to in describing a third exemplary option and (B) shows a cross sectional view to be referred to in describing a fifth exemplary option.
Fig. 4 relates to the first example and shows a plan view of the circuit board substrate which will be referred to in describing the step of dicing.
Figs. 5 (A)-(D) relate to the first embodiment of the invention wherein (A) shows a diagram to be referred to in describing the step of forming electrodes, (B) shows a diagram to be referred to in describing a first exemplary option of forming spacers, (C) shows a diagram to be referred to in describing the step of affixation and (D) shows a diagram to be referred to in describing the step of dicing.
Figs. 6 (A) and (B) relate to the first embodiment of the invention wherein (A) shows a back surface view of a circuit board substrate on which spacers are formed in accordance with a second exemplary option and (B) shows the cross sectional view cut along A-A of (A).
Figs. 7 (A) and (B) relate to the first embodiment of the invention wherein (A) shows a back surface view of a circuit board substrate on which spacers are formed in accordance with a third exemplary option and (B) shows the cross sectional view cut along A-A of (A).
Figs. 8 (A)-(B) relate to the second example, not according to the invention, wherein (A) shows a diagram to be referred to in describing the step of affixation and (B) shows a diagram to be referred to in describing the step of dicing. In each of (A) and (B), a plan view is shown on the right side while the cross sectional view cut along A-A of the plan view is shown on the left side.
Figs. 9 (A) and (B) relate to the second example and will be referred to in describing the planarization step wherein (A) shows a cross sectional view to be referred to in describing a first exemplary option and (B) shows a cross sectional view to be referred in describing a second exemplary option.
Figs. 10 (A) and (B) relate to the second example and will be referred to in describing the planarization step wherein (A) shows a cross sectional view to be referred to in describing a third exemplary option and (B) shows a cross sectional view to be referred to in describing a fourth exemplary option.
Fig. 11 relates to the second example and will be referred to in describing the planarization step, showing a cross sectional view to be referred to in describing a fifth exemplary option.
Figs. 12 (A)-(D) relate to the second embodiment of the invention wherein (A) shows a diagram to be referred to in describing the step of forming electrodes, (B) shows a diagram to be referred to in describing a first exemplary option of forming spacers, (C) shows a diagram to be referred to in describing the step of affixation and (D) shows a diagram to be referred to in describing the step of dicing.
Figs. 13 (A) and (B) relate to the second embodiment of the invention and show a cross sectional view of an integrated package body on which spacers are formed.
Figs. 14 (A) and (B) relate to the second embodiment of the invention wherein (A) shows a cross sectional view of an integrated package body on which spacers are formed in accordance with a second exemplary option and (B) shows a cross sectional view of an integrated package body on which spacers are formed in accordance with a third exemplary option.
Figs. 15 (A) and (B) relate to the third embodiment of the invention wherein (A) shows a diagram to be referred to in describing the step of affixation and (B) shows a diagram to be referred to in describing the step of dicing.
Figs. 16 (A) and (B) relate to the third example not according to the invention of the invention wherein (A) shows a diagram to be referred to in describing the step of affixation and (B) shows a diagram to be referred to in describing the step of dicing.
Fig. 17 relates to the fourth example, not according to the invention, and shows a plan view of the circuit board substrate.
Figs. 18 (A)-(C) relates to the fourth embodiment of the invention and will be referred to in describing a process for manufacturing semiconductor packages wherein (A) shows a diagram to be referred to in describing the step of forming circuit board substrates, (B) shows a diagram to be referred to in describing the step of mounting IC's and (C) shows a diagrams to be referred to in describing the step of resin encapsulation. In each of (A) through (C), a plan view is shown on the right side while the cross sectional view cut along A-A of the plan view is shown on the left side. In (B) and (C), IC connecting electrodes 3 and externally connecting electrodes 4 are not shown.
Figs. 19 (A)-(D) are step diagrams following Fig. 18 (C) wherein (A) shows a diagram to be referred to in describing the step of forming electrodes, (B) shows a diagram to be referred to in describing the step of affixation, (C) shows a diagram to be referred to in describing the step of forming spacers and (D) shows a diagram to be referred to in describing the step of dicing. In each of (A) through (D), a plan view is shown on the right side while the cross sectional view cut along A-A of the plan view is shown on the left side. In (A) through (D), IC connecting electrodes 3 and externally connecting electrodes 4 are not shown.
Fig. 20 shows a plan view of a substrate material.
Fig. 21 shows a plan view of a conventional circuit board substrate.
Figs. 22 (A) to (C) shows step diagrams to be referred to in describing a conventional process for manufacturing semiconductor packages wherein (A) shows a diagram to be referred to in describing the step of forming circuit board substrates, (B) shows a diagram to be referred to in describing the step of mounting IC's and (C) shows a diagrams to be referred to in describing the step of resin encapsulation. In each of (A) through (C), a plan view is shown on the right side while the cross sectional view cut along A-A of the plan view is shown on the left side. In (B) and (C), IC connecting electrodes 3 and externally connecting electrodes 4 are not shown.
Figs. 23 (A)-(C) are step diagrams following Fig. 22 (C) wherein (A) shows a diagram to be referred to in describing the step of forming electrodes, (B) shows a diagram to be referred to in describing the step of affixation and (C) shows a diagrams to be referred to in describing the step of dicing. In each of (A) through (C), a plan view is shown on the right side while the cross sectional view cut along A-A of the plan view is shown on the left side. In (A) through (C), IC connecting electrodes 3 and externally connecting electrodes 4 are not shown.
Best Modes to Implement the Invention
[0033] Hereinafter, embodiments of the invention will be described by referring to the drawings. The drawings merely schematically shows the size and shape of each of the components and the geometrical relation among them so as to understand the Invention. Thus, the present invention is not intended to be limited to these drawings.
[0034] In the following process for manufacturing semiconductor packages as described in the examples and embodiments, the steps of forming circuit substrates, the step of mounting IC's and the step of encapsulating by using resin will be substantially the same as the conventional steps already described by referring to Figs. 22 (A)-(C). Accordingly, these steps will not be discussed.
[First Example]
< Step of Forming Electrodes>
[0035] The first example will now be described by commencing with a discussion of the step of forming electrodes. In the process for manufacturing semiconductor packages in accordance with the first example, the step of forming electrodes will follow the step of resin encapsulation. In the course of this step of forming electrodes, before circuit boards 1 are obtained by dividing circuit board substrate 100, solder balls are positioned on the location of the externally connecting electrode 4 formed on the back surface of each circuit board 1 and subjected to a reflow processing, thereby forming protruded solder ball electrodes 9 as shown in Fig. 1 (A).
[0036] The composition of the solder balls is, as expressed in weight percentage, 40% of Pb and 60% of Sn with the melting point being at 180°C. The composition of the solder bumps used to mount IC chips 6 is, as expressed in weight percentage, 90% of Pb and 10% of Sn with the melting point being at 250°C, which is different from that of solder balls.
<Attaching Step>
[0037] Then, the attaching step is performed. In this attaching step, package body 100 formed as the result of the steps of forming circuit board substrates, mounting IC's and encapsulating by using resin is attached to a standard member. In the first example, as shown in Fig. (B), package body 100a is attached to standard member 8 with the side on which solder ball electrodes 9 are formed being directed to the standard member.
[0038] In the attaching step, it is preferable for package body 100a to be secured to standard member 8 by means of a fixing means such as an adhesive (including a PSA (pressure-sensitive adhesive) tape). For this adhesive, for example, thermally exfoliated "Elep-holder pressure sensitive type dicing tape SPV-224" (product name) manufactured by Nitto Denko Corporation is used.
[0039] Also, ultraviolet ray reactive type resin may be used as an adhesive agent, which can be, for example, UV tape "UE-2091J" (product name) manufactured by Nitto Denko Corporation. This UV tape may be used as two-sided adhesive. Upon being radiated by ultraviolet rays, the adhesion provided by this tape will drastically decrease so that it will be readily detached. Alternatively, a thermally reactive type resin or a solvent reactive type resin may be used.
[0040] Also in the affixation step, package body 100a may be attached to standard member 8 using a vacuum.
[0041] The surface of package body 100a on which solder ball electrodes 9 are formed, or the back surface of integrated circuit board substrate 100, is not planar because of the formation of the solder ball electrodes 9. Thus, in order to surely attach package body 100a to standard member 8, it is more preferable to planarize the back surface of this integrated circuit board substrate 100 before attaching it to standard member 8.
[0042] An exemplary method of planarizing the back surface of integrated circuit board substrate 100 in the affixation step of this example will now be explained by proposing the following first to fifth options.
(First Exemplary option)
[0043] In the first exemplary option, the top of each of solder ball electrodes 9 is planarized to the same height in the planarization process. In the planarizing process, the top portion of each of solder ball electrodes 9 is cut off so as to achieve the planarized level shown in Fig. 2 (A). When such a top portion is removed, a predetermined amount of the top portion is polished off by means of a polishing means such as a grinder, so that planarized surface 9a is formed on each of the top portions.
[0044] Then, in the attaching step to follow, planarized surface 9a is attached to standard member 8 by means of an adhesive (including adhesive tape) or a vacuum method.
(Second Exemplary option)
[0045] In the second exemplary option, the top of each of solder ball electrodes 9 is planarized to the same height in the planarization. In the planarizing process, the top portion of each of solder ball electrodes 9 is heated so as to achieve the planarized level shown in Fig. 2 (B). When the top portion is heated, the surface of package body 100a on which solder ball electrodes are formed is attached to heating plate 11. Then, by maintaining this heating plate at a predetermined temperature, a certain amount of the top portion of solder ball electrodes 9 is melted so that planarized surface 9a is formed.
[0046] Then, in the attaching step to follow, planarized surface 9a is attached to standard member 8 as in the case of the first exemplary option.
(Third Exemplary option)
[0047] In the third exemplary option, solder ball electrodes 9 are buried into resin 13 so that the upper surface of resin 13 forms a planarized surface as shown in Fig. 3 (A).
[0048] In forming a planarized surface, frame member 12 is set on the perimeter of the back surface of integrated circuit board substrate 100. This frame member 12 is consisted of metal or plastic member.
[0049] Resin 13 is then filled into the area surrounded by frame member 12 on the back surface so that solder ball electrodes 9 are buried in resin 13. In this example, thermally reactive type resin is used as resin 13. By curing the filled resin 13, planarized surface 13a is obtained as the cured upper surface of resin 13.
[0050] In the affixation step to follow, planarized surface 13a is secured to a standard member by means of adhesive or vacuum attraction.
(Fourth Exemplary option)
[0051] In the fourth exemplary option, solder ball electrodes 9 are buried in a resin so that the upper surface of the resin will form a planarized surface. In forming a planarized surface, solder ball electrodes 9 is buried in the resin by the screen printing method. A metal mask "T-31" (product name) manufactured by Asahi Kaken Coporation is used for the screen printing. The resin is hardened at the temperature of about 130°C.
[0052] In the affixation step to follow, the planarized surface is attached to standard member 8 as in the case of the third exemplary option.
(Fifth Exemplary option)
[0053] In the fifth exemplary option, frame member 12a is set on main surface 8a of standard member 8. The combination of main surface 8a and frame member 12a will form a bath. Standard member 8 is mounted on Peltier element 14.
[0054] Then, material layer 15 is formed as surrounded by frame member 12a on this main surface 8a, which reversibly transitions itself into a solid state or a liquid state depending upon temperature. The material used for material layer 15 is water in this case.
[0055] At least a portion of solder ball electrodes 9 including the top thereof is immersed into liquid material layer 15 as shown in Fig. 3 (B).
[0056] Further, material layer 15 is transitioned into a solid state while a portion of the solder ball electrodes 9 is immersed therein. Water is frozen into ice by using the Peltier element to cool down the material layer to a temperature below the freezing point. As the result, package body 100a is fixed to standard member 8 with water being an adhesive.
[0057] The above described manner allows the planarization and affixation to be performed in a single step in the fifth exemplary option.
[0058] After the cutting step which will later be explained in more details, by using Peltier element 14 to heat up the material layer to a temperature above the freezing point, the ice is melted. Thus, completed semiconductor package 10 obtained by detaching the divided circuit board substrate (100) from the standard member 8.
[0059] Although water is used as material layer 15 in the third embodiment, the material for this material layer is not limited to water. For example, a wax such as commercially available "apieson" may also be used. Wax, which is in a solid state at room temperature, becomes liquid by heating it to a higher temperature.
<Cutting Step>
[0060] The cutting step is now performed on the package body attached to standard member,8 by either of the first to fifth exemplary options described above. In the cuttinng step, package body 100a is diced into single circuit substrates 1 as shown in Fig. 1(C).
[0061] In this case, when the cutting step starts, standard member 8 to which package body 100a is attached is set to a dicing apparatus (not shown). As the dicing apparatus, "DFD-640" (product name) manufactured by Disco Corporation is used for example. And as the dicing blade, "NBC-ZB1090S3" (product name) is used which has the width of 0.1mm and diameter of 52mm. This dicing blade is rotated 3000 times per minute and moved 50mm per second with respect to the standard member. Pure water is supplied to the dicing interface at the rate of 1.5 liter per minute, so that it will cool down the interface and remove the particles.
[0062] When solder ball electrodes 9 are immersed into a resin in the affixation step, the resin is also diced together with said package body. After the cutting step, completed semiconductor package 100a is detached from standard member 8. Thus, diced package body 100a is separated into individual circuit boards 1.
[0063] The adhesive is then dissolved by means of solution and circuit boards 1 are detached from standard member 8, thereby obtaining completed semiconductor package 10 as shown in Fig.1(D).
[0064] When solder ball electrodes 9 are attached to standard member 8 by means of an adhesive, the completed semiconductor package is washed with a washing agent after the exfoliation so as to remove the remaining adhesive. As the washing agent, "Clean Through" (product name) manufactured by Kao Coporation is used for example. After the cleaning by the washing agent, the package will be further washed with pure water. Then, the completed semiconductor package is dried in an oven.
[0065] Here, the dicing order in the cutting step will now be described by referring to Fig. 4, which is a plan view of integrated circuit board substrate. On integrated circuit board substrate 100, a circuit pattern is formed for the CSP's of a plurality of circuit boards by the electro-plating method. This circuit pattern comprises common electrodes 16 and 16a, branched wiring 16b and circuit pattern 16c for CSP's. Two common electrodes 16 extend along the X direction. Further, common electrodes 16a extend in the Y direction by connecting the two common electrodes 16. Circuit pattern 16c is arranged to extend along the both sides of each common electrode 16a. Common electrode 16a and circuit pattern 16c are connected via a branched wiring 16b.
[0066] After package body 100a is formed by using this integrated circuit board substrate 100, this body is diced along the dicing lines indicated by dotted lines A to K and ① to ⑤.
[0067] Since the distance between the dicing lines in the portions including common electrodes 16a in the Y direction (between B arid C, E and F, and I and J) is smaller than that in other portions (A and B, C and D, F and G, H and I, and J and K). Where the distance between the dicing lines is small or where dicing interval is narrow, the affixation to the standard member is weaker than in other cases because the area is smaller. Thus, if the dicing is performed from A to K in the Y direction, the substrate including common electrodes 16a in the Y direction may be deformed or the dicing line may deviate from the intended dicing lines.
[0068] Therefore, in this example, when the dicing is performed along the dicing line extending in the Y direction, the dicing is performed in the order of A, B, D, E, G, H, I, K, C, F and J. If the dicing is performed in this order, since the dicing lines the distance between which is small will not be continuously diced, no deformations of the substrates and deviations from the dicing lines will not occur.
[0069] When the dicing is performed along the dicing lines along the X direction, the dicing is performed in the order of ① to ⑤.
<First Embodiment>
[0070] The first embodiment of the Invention will now be described. In the cutting step, the separation areas other than circuit boards 1 in integrated circuit board substrate 100, for example blank manufacturing areas (margin for fabricating) is cut into separate pieces. In the separation areas, however, no solder balls 9 are formed. Thus, these separation areas may not be attached to standard member 8 in some cases. In such cases, the separated pieces of separation areas will move about in the dicing machines, which may damage the dicing blades or IC chips. Thus, in the method of manufacturing semiconductor packages in the first embodiment, spacers are formed in the separation areas on the back surface of integrated circuit board substrate 100 and the separation areas are attached to standard member 8 through these spacers.
[0071] In the method of manufacturing semiconductor packages in accordance with the first embodiment, the step of forming electrodes is performed after the step of resin encapsulation. In this step of forming the electrodes, just as in the case in accordance with the first example, solder ball electrodes 9 are formed as protruded electrodes as shown in Fig. 5 (A).
[0072] Then, in this embodiment, the step of forming spacers is performed before the step of affixation. In the step of forming the spacers, spacers 17 are formed, as shown in Fig. 5(B), on the separation areas of the back surface of integrated circuit board substrate 100 which are to be cut off from circuit board 1. In this case, spacers 17 are formed using one of the following first to third exemplary options on all the individual pieces of manufacturing blank areas 1a.
[0073] The height of spacers 17 is set as being substantially the same as solder ball electrodes 9. This is because it is impossible for the separation areas to be fixed to the standard members if the spacers are too low.
[0074] If there exists a defective circuit board on which no protruded electrodes are formed, spacers 17 are formed on each of the defective circuit substrate areas.
(First Exemplary option)
[0075] In the first exemplary option, as shown in Fig. 5 (B), the material used for spacers 17 will be the same as that of solder ball electrodes 9. In a manner similar to how solder ball electrodes 9 are formed, solder balls (not shown) will be placed on the blank area and subjected to a reflow processing, so that spacers will be formed.
[0076] It is preferable for spacers 17 to be formed together with solder ball electrodes 9 during the step of forming the electrodes.
(Second Exemplary option)
[0077] In the second option, as shown in Fig. 6, spacers are formed by hardening the resin. Spacers 17 are, as shown in Fig. 6 (B), placed in a two-dimensional linear pattern as surrounding the area that will be the circuit boards 1 on the manufacturing blank area 1a of the back surface of integrated circuit board substrate 100.
(Third Exemplary option)
[0078] In the third exemplary option, as shown in Fig. 7 (A), a member whose cross section is rectangular is used as spacer 17. Spacer 17 is, as shown in Fig. 7 (B), placed in a two-dimensional linear pattern surrounding the area that will be cut from circuit boards 1 on the manufacturing blank area 1a of the back surface of integrated circuit board substrate 100.
<Affixation Step>
[0079] Next, an affixation step is, as in the case of the first example, performed to package body 100a on which spacers 17 have been formed in accordance with one of the first to third options described above. In this affixation step, in accordance with this embodiment, a separation area is affixed to standard member 8 via spacers 17.
<Cutting Step>
[0080] Then, a cutting step is, as in the case of the first example, performed. In this embodiment, during the dicing step, the separation area is fixed to standard member 8. Thus, it can be avoided that the cut off separation area jumps toward the dicing blade and damages it.
[Second example)
[0081] In the method of manufacturing semiconductor packages in accordance with the second example, the steps up to the step of forming electrodes are the same as in the case of the first example. Thus, the step of forming electrodes will not be explained in this example.
<Affixation Step>
[0082] In the second example,as in the case of the first example, an affixation step is performed after the step of forming electrodes. In the affixation step, package body 100a which is formed as the result of the steps of forming the substrate, mounting IC's, encapsulating with resin and forming electrodes is affixed to the standard member. In the second example, as shown in Fig. 8 (B), the side of package body 100a on which IC chips 6 are formed is affixed to the standard member.
[0083] In this affixation step, package body 100a is affixed to standard member by using such a fixation means such as an adhesive agent (including an adhesive tape), which is the same as in the case of the first example.
[0084] Even if any adhesive agent is left on the upper side of IC chips 6 which are detached from standard member 8, the performance of IC chips will not be adversely affected.
[0085] The side of the package body 100a on which IC Chips are mounted on the main surface of integrated circuit board substrate 100 is not planar. In particular, the thickness of the encapsulating resin on the upper side of each IC chip is not the same. Thus, in order for package body 100a to be attachly affixed to standard member 8, it is preferable for the main surface of this integrated circuit board substrate 100 to be better planarized so as to be better affixed to standard member 8.
[0086] Thus, in this example, during the affixation step, the back surface of integrated circuit board substrate 100 will be planarized in accordance with the following first to fifth exemplary- options, which will be described below.
(First Exemplary option)
[0087] In the first exemplary option, the upper surface of each of IC chips 6 is planarized to the same height during the planarization step. In the planarization, the upper surface of each of IC chips is, as shown in Fig. 9 (A), polished together with encapsulating resin 7 so that the upper surface will be planarized. The height from the main surface of integrated circuit board substrate 100 to the planarized upper surface 6a, however, must be higher than that from this main surface to the circuit surface of IC's within IC chips 6.
[0088] Then, in the affixation step, the planarized upper surface is affixed to standard member 8 by means of an adhesive agent (including an adhesive tape) or such fixation means as a vacuum attraction device.
(Second Exemplary option)
[0089] In the second exemplary option, the upper surface of each of IC chips 6 is planarized to the same height during the planarization step. In the planarization, the upper surface of the deposited encapsulating resin 7 is polished so that the upper surface will be planarized. However, if IC chips 6 are mounted by using wire bonding, the height h1 from the main surface of integrated circuit board substrate 100 to the planarized upper surface 7a must be higher than that from this main surface to the highest point of the wire bonding.
[0090] Then, in the affixation step, the planarized upper surface is affixed to standard member 8 as in the case of the first exemplary option.
(Third Exemplary option)
[0091] In the third exemplary option, during the step of forming a planarized surface, planar surface 13a is formed as the upper surface 13a of resign 13 as shown in Fig. 10 (A) by burying IC chip 6 by using resin 13. In forming planar surface 13a, frame member 12 is set in the outer perimeter of the main surface of integrated circuit board substrate 100. This frame member 12 is composed of a metal or a plastic member.
[0092] Then, resin 13 is filled into the region surrounded by frame member 12 on the main surface so that the IC chips are buried. In this case, thermally reactive resin is used. By hardening the filled resin 13, planar surface 13a is formed as the hardened upper surface of resin 13.
[0093] Next, in the step of affixing the planar surface, planar surface 13a is affixed to the standard member by means of an adhesive agent or such fixation means as a vacuum attraction device.
(Fourth Exemplary option)
[0094] In the fourth exemplary option, during the step of forming a planarized surface, planar surface 13a is formed as the upper surface of resin 13 by burying IC chips 6 by using resin. In forming the planar surface, as shown in Fig. 10 (B), IC chips 6 are buried in the resin in accordance with the transmold method.
[0095] Alternatively, in burying the IC chips in the resin, the screen-print method may also be employed.
[0096] Then, in the step of forming the planarized surface, the planar surface is affixed to standard member 8 as in the case of the third exemplary option.
(Fifth Exemplary option)
[0097] In the fifth exemplary option, the first main surface of a planar board is affixed to the upper surface of the deposited encapsulating resin on the IC chips. The planar board used in this case is a metal board having a good thermal conductivity such as an aluminum board, copper board or an alloy comprising copper and tungsten. This planar board also functions as a heat releaser.
[Second Embodiment]
[0099] In the cutting step, the separation areas such as a manufacturing blank area other than circuit board 1 of integrated circuit board substrate 100 is also cut off as individual pieces. However, the separation areas do not have solder ball electrodes 9 formed on them. Thus, the separation areas may not be affixed to standard member 8 during the dicing process. In such cases, the pieces cut off by the dicing step jump around in the dicing apparatus. Consequently, the dicing blade and IC chips may be damaged.
[0100] Thus, in the method of manufacturing semiconductor packages in accordance with the second embodiment, spacers are formed in the separation area on the main surface of integrated circuit board substrate 100 and the separation area will be affixed to standard member 8 via these spacers.
<Step of Forming Electrodes>
[0101] In the method of manufacturing semiconductor packages in accordance with the second embodiment, the step of forming electrodes follows the step of resin encapsulation. In this step of forming electrodes, as in the case of the first embodiment, as shown in Fig. 12 (A), solder ball electrodes are formed as protruding electrodes.
<Step of Forming Spacers>
[0102] Next, in this embodiment, the step of forming spacers is performed before the step of affixation. In the step of forming spacers, spacers 17 are formed on the separation area which will be cut off from circuit boards 1 in the dicing step on the main surface of integrated circuit board substrate 100 as shown in Fig. 12 (B). In this case, spacers 17 of the following first to third exemplary options are formed on all the pieces of the manufacturing blank areas la and each of the defective circuit substrate areas 1b where said protruding electrodes are not formed.
[0103] The height of spacers 17 must be the same as the distance between the integrated circuit board substrate 100 and standard member 8 when package body 100a is affixed to standard member 8. This is because it is not possible for the separation area to be fixed to the standard member if the spacers are too low.
(First Exemplary option)
[0104] In the first exemplary option, as shown in Fig. 13 (A), spacers 17 are formed by hardening the resin. In this case, an appropriate amount of resin is dropped onto manufacturing blank area 1a and defective circuit substrate area 1b. The amount of resin dropped must be such that the height of the hardened resin is at least as high as the distance between integrated circuit substrate 100 and standard member 8.
[0105] If the height of the hardened resin is higher than this distance as shown in Fig. 13 (B), the upper surface of the resin is pressed down by, for example, a planar board so that the predetermined height of spacers 17 can be obtained.
[0106] Resins such as thermally hardening resin, ultraviolet hardening resin or thermally deformable resin will be used. If a thermally hardening resin is used, the resin is heated to be hardened after the resin is dropped to be deposited.
(Second Exemplary option)
[0107] In the second exemplary option, base 17b having adhesive agent 17a is, as shown in Fig. 14 (A), used as spacers. For base 17b, a board made of a resin or metal will be used. Then, adhesive agent 17a is attached to at least a portion of the both sides or only one side of base 17b. Base 17b is attached to the main surface of integrated circuit board substrate 100 using this adhesive agent 17a.
(Third Exemplary option)
[0108] In the third exemplary option, as shown in Fig. 14 (B), dummy IC chips 17 are formed as spacers 17.
[0109] If adhesion is not sufficient between dummy IC chips 7 as spacers and integrated circuit substrates 100, it is preferable that encapsulating resin 7 is flown there between.
<Affixation Step>
[0110] Next, an affixation step is performed, as in the case of the first example, to package body 100a an which spacers 17 are formed in accordance with the above described first to third exemplary options. In the affixation step, in this embodiment, the separation area is affixed to standard member 8 via spacers 17.
<Cutting Step>
[0111] Next, a cutting step is performed as in the case of the first example. In this embodiment, during the dicing process, the separation area is fixed to standard member 8. Thus, it is possible to avoid the cut off separation area from damaging the dicing blade by jumping around.
[Third Embodiment]
[0112] In the method of manufacturing semiconductor packages in accordance with the third embodiment, in the affixation step, the side of package body 100a on which solder ball electrodes 9 are formed as in the case of the first example is vacuum attracted to standard member 8, which will be described below.
[0113] In the affixation step, spacers 17 are formed on manufacturing blank area la of the back surface of integrated circuit board member 100 and on the defective circuit substrate area 1b. In this case, each spacer has an opening therein extending from the circuit board substrate (100) to the standard member (8). Also, dicing tape 20 is affixed on the upper edge of each of solder ball electrodes 9. The standard member has a passageway therein which has openings to the dicing tape, and further openings aligned to the openings in the spacers, as shown in Figure 15A.
[0114] The height of spacers 17 must be the sum of the height of solder ball electrodes 9 and the thickness of dicing tape 20. For example, if solder ball electrodes 9 are approximately 0.6mm high and dicing tape 20 is approximately 0.1mm thick, then spacers 17 are approximately 0.7mm.
[0115] Then, this dicing tape 20 and spacers 17 are vacuum attracted to standard member 8. As shown in Fig. 15 (A), one end of the passageway terminates in the standard member, the other end of the tube passageway is connected to a vacuum pump (not shown).
[0116] Next, in the cutting step, while package body 100a is vacuum attracted to standard member 8, integrated circuit board substrate 100 is, as shown in Fig. 15 (B), cut by a dicing process.
[Third Example]
[0117] In the method of manufacturing semiconductor package in accordance with the third example, in the affixation step, the side of package body 100a formed as in the case in the first example on which IC chips 6 are mounted is vacuum attracted to standard member 8, about which an explanation will be given below.
[0118] In the affixation step, spacers 17 are formed on manufacturing blank area la of the main surface of integrated circuit board member 100 and on the defective circuit substrate area 1b. In this case, spacers 17 have openings as described above and the, a standard member will be used which has a passageway inside as previously described. Also, dicing tape 20 is affixed on the upper edge of each of solder ball electrodes 9 as in the third embodiment.
[0119] The height of spacers 17 must be the sum of the height of IC chips 6, the thickness of IC connecting electrodes 3 and the thickness of dicing tape 20. For example, if IC chips 6 are approximately 0.625mm high, IC connecting electrodes 3 are approximately 0.1mm thick and dicing tape 20 is approximately 0.1mm thick, then spacers 17 are approximately 0.825mm.
[0120] Then, this dicing tape 20 and spacers 17 are vacuum attracted to standard member 8 exactly as described with respect to figure 15A. Again, one end of the attracting tube is connected to a vacuum pump (not shown).
[0121] Next, in the cutting step, while package body 100a is vacuum attracted to standard member 8, integrated circuit board substrate 100 is, as shown in Fig. 16 (B), cut by a dicing process.
[Fourth Example]
[0122] In the fourth example, an example of integrated circuit board substrate 100 used for manufacturing semiconductor packages will be given.
[0123] Integrated circuit board substrate 100 in the fourth example is divided into a plurality of circuit boards 1. This integrated circuit board substrate 100 has, as shown in Fig. 17, blank manufacturing area la on the opposed two sides F2 and F4 of four peripheral sides surrounding itself. Thus, the remaining two sides F1 and F3 of this integrated circuit board substrate do not have blank manufacturing areas. In other words, these two remaining sides are the sides of circuit substrate 1.
[0124] Integrated circuit board substrate 100 is normally formed from substrate material by die-cut molding. Thus, the edges of a conventional integrated circuit board substrate are shear plane die-cut with a mold. Since the shear plane has a coarse surface, it is not preferable as an edge of circuit substrate.
[0125] Thus, in this example, in order to form the two sides F1 and F3 which will be the sides of circuit boards, the same cutting method as used to divide integrated circuit board substrate 100 into a plurality of circuit boards 1 is used. The dicing method, for example, is preferable. If the dicing method is employed, these two sides F1 and F3 may be used as the edges of circuit boards 1.
[0126] Further, if the dicing method is used, the edges will be accurately positioned as well as they have a smooth surface. The blank area required for dicing is extremely narrow compared to that for other cutting method.
[0127] As already discussed above, the integrated circuit board substrate is formed by cutting substrate material. This substrate material is formed by cutting an original board with a predetermined size. The original board is normally 1m wide. Substrate materials are formed by equally dividing this width of 1m. If 1m width is equally divided into 2, 3, 4 and 5 parts, the obtained width will be approximately 500, 330, 250 and 200mm. If the manufacturing blank areas on the both sides are subtracted from these divided widths, the remaining effective value of the divided width will be approximately 490, 320, 240 and 190mm.
[0128] These effective values of the divided widths will be further equally divided and subtracted by the cutting blank areas, then becoming the width of integrated circuit board substrate.
[0129] The width of the substrate material which depends on the number the dividing of original board in a predetermined size. Thus, since the area of the unused region the width of which is smaller than that of integrated circuit board substrate is large in some cases, a quite large amount of material has been wasted in the prior art.
[0130] Thus in this example, in order to minimize the waste of the material, the common length (A) of the two sides Fi and F3 of all the four sides of integrated circuit board substrate 100 is shared by different dividing number (such as in other words, the common length (A) satisfies the conditions such that supposing one side of a specified size substrate has a length (L), a length M1 obtained by dividing L by K1 (M1=L/K1) and a length M2 obtained by dividing L by K2 (M2=L/K2) are respectively a product of the common length (A) multiplied by an integer).
[0131] This is preferably 76mm to 81mm wide depending upon the relationship between the number of integrated circuit board substrates 100 taken from the substrate material and the width of the integrated circuit board material.
[0132] Thus, if this shared common length is employed, the manufacturing processes may be readily automated, thereby improving the productivity of the integrated circuit board substrate. Consequently, since the manufacturing cost of the integrated circuit board substrate can be lowered, the manufacturing cost of the semiconductor package may also be lowered.
[0133] Further, this shared common length is longer than the width of the conventional normal integrated circuit board substrate (56mm). Thus , by employing this shared common length, the dividing number by which the substrate material is divided into integrated circuit board substrates may hopefully be fewer than in the conventional cases. If this dividing number may be smaller, the blank area for the division will also be smaller. Therefore, by employing the shared common length, the substrate material can be more efficiently used.
[0134] Table 1 below shows the widths of the integrated circuit board substrates when the dicing method is used. The cutting blank area in this case is 0.2mm.
[0135] In the Table 1, b represents the divided length of the substrate material and n represents how many the divided length is further divided into. In Table 1, when the original board of predetermined (standardized) size (1m wide) is divided into two and divided length b is 500mm, the width W2 of the integrated circuit board substrate in the case where six (=n) is taken is 81.5mm. Similarly, when the original board is divided into three and divided width b is 330mm, W2 is 79.9mm if n is four. When the original board is divided into four and divided width b is 250mm, W2 is 79.9mm if n is three.
[0136] Table 2 below shows the widths of the integrated circuit board substrates when the routing method is used as the cutting method. The cutting blank area in this routing is 2mm.
[0137] In the Table 2, b represents the divided length of the substrate material and n represents how many the divided length is further divided into. In Table 2, when the original board of predetermined (standardized) size (1m wide) is divided into two and divided length b is 500mm, the width W2 of the integrated circuit board substrate in the case where six (=n) is taken is 80.0mm. Similarly, when the original board is divided into three and divided width b is 330mm, W2 is 78.5mm if n is four. When the original board is divided into four and divided width b is 250mm, W2 is 78.7mm if n is three.
[0138] Table 3 below shows the widths of the integrated circuit board substrates when the routing method is used as the cutting method and cutting is performed so that the cutting blank area is 5mm wide and a tie bar is left. The cutting blank area in this routing is 0.2mm.
[0139] In Table 3, b represents the divided length of the substrate material and n represents how many the divided length is further divided into. In Table 3, when the original board of predetermined (standardized) size (1m wide) is divided into two and divided length b is 500mm, the width W2 of the integrated circuit board substrate in the case where six is taken is 77.5mm. Similarly, when the original board is divided into three and divided width b is 330mm, W2 is 76.3m if n is four. When the original board is divided into f our and divided width b is 250mm, W2 is 76.7mm if n is three.
[0140] Therefore, from the above Tables 1 to 3, if the width W2 of integrated circuit board substrate is 76 mm to 81mm, integrated circuit board substrate 100 may be cut off so that it will have a common width with respect to a plurality of the divided numbers of the original board.
[Fourth Embodiment]
[0141] In this fourth embodiment, the example of manufacturing semiconductor packages will be described by using the integrated circuit board substrate of the fourth example.
[0142] Also in Fig. 18, integrated circuit board substrate 100 is divided into four circuit boards 1, which is merely exemplary. This integrated circuit board substrate 100 has manufacturing blank areas only on two sides out of all the four sides on its perimeter, each of which is 5mm wide.
<Step of Forming Circuit Substrate>
[0143] In manufacturing semiconductor packages, as shown in Fig. 18 (A), in the step of forming circuit substrates, IC connecting electrodes 3 are formed on the main surface of integrated circuit board substrate 100 which will be cut into a plurality of circuit boards 1 and externally connecting electrodes 4 will be formed on the back surface of this integrated circuit board substrate 100. In both cases, these electrodes are arranged for more than one circuit board.
<Step of Mounting IC Chips>
[0144] Then, in the step of mounting IC chips, as shown in Fig. 18 (B), IC chip 6 is mounted on each of circuit board 1 on the main surface of integrated circuit board substrate 100. Further, IC chips 6 are mounted on integrated circuit board substrate 100 by electrically connecting IC connecting electrodes 3 and IC chips 6.
<Step of Resin Encapsulation>
[0145] Next, in the step of resin encapsulation, as shown in Fig. 18 (C), IC chips are encapsulated with resin.
<Step of Forming Electrodes>
[0146] Next, in the step of forming electrodes, as shown in Fig. 19 (A), solder ball electrodes 9 are formed on externally connecting electrodes. 9.
<Step of Forming Spacers>
[0147] Next, in this embodiment, in the step of forming spacers, as shown in Fig. 19 (B), spacers 17 are formed on the manufacturing blank areas 1a of the main surface of integrated circuit board substrate 100.
[0148] In this case, as shown in Fig. 19 (B), spacers 17 are formed as linearly extending on two manufacturing blank area 1a. The shape of the cross-section of spacers 17 is rectangular.
[0149] In the conventional integrated circuit board substrates, a frame of manufacturing blank areas are formed on all the four side of the perimeter. Thus, when spacers are formed on the conventional manufacturing blank areas, the two-dimensional pattern of the spacers will also be of rectangular frame. In order to form spacers of two-dimensional frame pattern, a layer that will be spacers will first be formed across the integrated circuit board substrate and then the area corresponding to circuit boards 1 will be removed.
[0150] As opposed to this, in this embodiment, since spacers 17 are formed as a simple linear form, the above removal procedure is not necessary. Thus, in this embodiment, spacers 17 are more readily formed than in the conventional cases. Since the above removal procedure is not necessary, the material for spacers 17 is hardly wasted. Thus the manufacturing cost can be lowered. Since the removal procedure is not necessary, the present method is suitable for automation of the manufacturing process, thereby improving the productivity.
<Affixation Step>
[0151] Next, in the affixation step, package body 100a which is formed by the steps of forming circuit boards, mounting IC chips, encapsulating with resin and forming electrodes is affixed to standard member 8. In this example, as shown in Fig. 19 (C), the side of package body 100a on which IC chips 6 are formed is affixed to standard member 8. Manufacturing blank area 1la of integrated circuit board substrate 100 will be affixed to standard member 8 via spacers 17.
<Cutting Step>
[0152] Next, in the cutting step, package body 100 is diced, as shown in Fig. 19 (D) into circuit boards 1, thereby forming a plurality of completed semiconductor packages.
[0153] In the above described embodiments, although particular materials are used for forming elements in specific situations, a number of modifications and changes are possible to this invention. For example, the step of forming electrodes follows the step of resin encapsulation in the above described embodiments, the step of forming electrodes may be performed at any arbitrary moment as long as it is after the step of forming the substrate and before the affixation step. For example, the step of forming electrodes may be performed before the step of mounting IC chips.
Industrial Applicability
- a step of fabricating a circuit board substrate (100) by forming a plurality of bonding patterns (3) on a main surface of a substrate, on which bonding patterns (3) IC chips (6) are to be mounted, and forming a plurality of electrode patterns for external connection (4, 9) arranged in a matrix on the back of the substrate, thus forming a circuit board substrate (100), which comprises a plurality of circuit boards;
- a step of mounting an IC chip on each bonding pattern (3) on the main surface of the circuit board substrate (100) and electrically connecting the bonding patterns (3) and IC chips (6);
- a step of sealing the IC chips (6) with a sealing resin (7) ;
- a step of forming projection electrodes on the electrode patterns for external connection (4, 9), the projection electrodes (4, 9) thus also being in the matrix arrangement;
- a step of forming spacers (17) on the back of the circuit board substrate (100) in areas to be separated from the circuit boards, thus forming a package unit (100a) ;
- a step of attaching the package unit (100a) to a standard member (8) using the spacers (17), the standard member serving as a temporary substrate during cutting of the package unit (100a) ;
- a step of cutting the package unit (100a) affixed on the standard member (8) into individual circuit boards; and
- a step of removing the standard member (8), thereby obtaining a plurality of semiconductor packages, each having one circuit board and one IC chip (6) on the circuit board.
- einen Schritt der Herstellung eines Leiterplattensubstrats (100), indem eine Vielzahl von Bindungsmustern (3) auf einer Hauptoberfläche eines Substrates gebildet werden, wobei auf den Bindungsmustern (3) IC-Chips (6) angebracht werden, und Herstellung einer Vielzahl von Elektrodenmustern für den externen Anschluss (4, 9), welche in einer Matrix auf der Rückseite des Substrats angeordnet sind, wodurch ein Leiterplattensubstrat (100) gebildet wird, welches eine Vielzahl von Leiterplatten aufweist;
- einen Schritt des Anbringens eines IC-Chips auf jedem Bindungsmuster (3) auf der Hauptoberfläche des Leiterplattensubstrats (100) und elektrisches Verbinden der Bindungsmuster (3) und IC-Chips (6);
- einen Schritt der Versiegelung der IC-Chips (6) mit einem Versiegelungsharz (7);
- einen Schritt der Bildung von vorstehenden Elektroden auf den Elektrodenmustern für den externen Anschluss (4, 9), wobei die vorstehenden Elektroden (4, 9) somit auch in der Matrix-Anordnung sind;
- einen Schritt der Bildung von Abstandshaltern (17) auf der Rückseite des Leiterplattensubstrats (100) in Bereichen, welche von den Leiterplatten getrennt werden sollen, wodurch eine Paketeinheit (100a) gebildet wird;
- einen Schritt der Befestigung der Paketeinheit (100a) an einem Standardelement (8) unter Verwendung der Abstandshalter (7), wobei das Standardelement (8) als ein temporäres Substrat während dem Schneiden der Paketeinheit (100a) dient;
- einen Schritt des Schneidens der Paketeinheit (100a), welche auf dem Standardelement (8) angebracht ist, in individuelle Leiterplatten; und
- einen Schritt des Entfernens des Standardelements (8), wodurch eine Vielzahl von Halbleiterpaketen erhalten wird, welches jeweils eine Leiterplatte und einen IC-Chip (6) auf der Leiterplatte hat.
- une étape de fabrication d'un substrat pour plaques de circuit (100) en formant une pluralité de motifs de liaison (3) sur une surface principale d'un substrat, sur lesquels motifs de liaison (3) des puces à CI (6) devront être montés, et former une pluralité de motifs d'électrodes pour une connexion externe (4, 9) arrangés dans une matrice sur le dos du substrat, formant ainsi un substrat pour plaques de circuit (100), qui comprend une pluralité de plaques de circuit;
- une étape de montage d'une puce à CI, sur chaque motif de liaison (3) sur la surface principale du substrat pour plaques de circuit (100) et connecter électriquement les motifs de liaison (3) et les puces à CI (6);
- une étape de sceller les puces à CI (6) avec une résine de scellage (7);
- une étape de formation d'électrodes à projection sur les motifs d'électrodes pour connexion externe (4, 9), les électrodes à projection (4, 9) étant ainsi dans l'arrangement matrice;
- une étape de formation d'entretoises (17) sur le dos du substrat pour plaques de circuit (100) dans des régions destinées à être séparées des plaques de circuit, formant ainsi une unité de boîtier (100a);
- une étape de fixation de l'unité de boîtier (100a) à un membre standard (8) utilisant les entretoises (17), le membre standard servant comme substrat temporaire pendant le coupage de l'unité de boîtier (100a);
- une étape de coupage de l'unité de boîtier (100a), apposée sur le membre standard (8), en plaques de circuit individuelles; et
- une étape d'ôtage du membre standard (8), obtenant ainsi une pluralité de boîtiers pour semi-conducteurs, chacun ayant une plaque de circuit et une puce à CI (6) sur la plaque de circuit.
REFERENCES CITED IN THE DESCRIPTION
This list of references cited by the applicant is for the reader's convenience only. It does not form part of the European patent document. Even though great care has been taken in compiling the references, errors or omissions cannot be excluded and the EPO disclaims all liability in this regard.
Patent documents cited in the description